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(No Mode.)

J. W. lVIAGKl\TIGrI-IT.A

METHOD 0E LAYING ARTIFICIAL PAVEMENT. No. 393,568. Patented Nov. 27, 1888.

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m, W a gf' Nv PETERS. Pham-Lnmgmpner, Wuhingwn. D C.

UNITED STATES PATENT OFFICE.

JOHN W. MACKNIGHT, OF NEW YORK, N Y.

METHOD OF LAYING ARTIFICIAL PAVEMENTS.

SPECIFICATION forming part of Letters Patent No. 393,568. dated November 27, 1888.

Application tiled September 3, 1888. Serial No. 284.447. (No modeLl To all whom t may concern:

Be it known that I, JOHN W. MAOKNIGHT, of New York city, New York, have inventeda new and Improved Method of Hardening the Surface of an Articial Pavement, of which the following is a specification.

rlhis invention relates to an improved method of hardening the surface of an artificial pave ment. Its object is more particularly to form a hard corrugated surface or finish upon the uppermost layer.

'.Fhcinvcntion consists in the various features of improvement more fully pointed out in the claims. A

l'n the accompanying drawings, Figure Il. is a perspective view, partly in section,olf an artificial pavement constructed according to my improved method. Fig. 2 is an enlarged vertical transverse section through part of the upper layer of the same.

ln laying my improved pavement l iirst form a base of rocks, with an upperlayer, I, of eoal-ashes,tlicse two layers constituting the foundation. Upon the foundation there is placed the third layer, c,composed ofone part ofashes, one part ofsand,and of a suitable quantity of cement. Upon thelayer c there is placed the top layer, d, composed of crushed traprock and hydraulic cement. The layer d slopes from house-line to curb-line to constitute a water-shed, and both layers, c d, are turned downward at the curb to form the curbstone. N'Vhilc the layer d is still in a plastic condition l corrugate it by a suitable roller from houseline to curloline7 and preferably also down the curb to the lower edge of the same. Thus water-ways will be forn'1ed,which7 as the pavement has a fall, will conduct the water directly down into the gutter. As the ribs between the corrugations are comparatively thin,

it is of importance that they should be thor onghly hardened while setting. To this effect- I pour a wash over the surface of the pavement directly after the ribs are formed. This wash will fiow along the grooves down into the glitter, and while flowing will come into contact with both sides of the ribs. Thus the ribs are for a time inclosed between two streams ofthe wash. As hydraulic cement sets most quickly and perfectly when air is eicluded and when under water, the ribs will quickly and thoroughly harden. By extending the grooves down to the guttenline the wash will not spread all over the curb7 but will How down in even streams to uniformly harden the entire curb.

The wash I prefer to use consists of ten parts of water, two parts of ammonia, two parts of al um, and one part of an iron solution. After the ribs have been subjected to the'wash for about thirty minutes the pavement is comA pleted.

\Vhat l claim is- 1. The method of hardening an artificial pavement, which consists in forming grooves in the surface of the top layer while still plastic from house-line to curb and pouring a hardeningwash into the grooves,substantially as specified.

2. The method of hardening an artificial pavement, which consists in forming grooves in the top layer while still plastic and pouring a wash consisting of water, am n1onia,alum, and iron into the grooves, substantially as specified. Y

JO HN V. MA CKNIGHT.

Wil messes:

F. v. BRrEsEN, HENRY E. ROEDER. 

